Defective pro mini and the solution

  • Hi!
    I had a pro mini which stopped working with the following symptoms:

    • No communication
    • not even a flicker on Pin 13 LED
    • not responding to programming attempts, not even with ISP.
    • RST pin has a voltage of ca. 100mV

    The pro mini started working again without me doing anything and then after a few months stopped working again.

    After a lot of soldering (replacing most components including the atmega) it turned out that the board had a ca. 100 Ohm short between RST and GND...

    So if you experience the above symptoms just measure resistance between RST and GND.

  • Mod

    @fleinze interesting experience. Thanks for sharing.

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